Accurate low voltage detect circuit

Details Accurate low voltage detect circuit Accurate low voltage detect circuit

1992-10-20

1995-08-08

Wolfe, Willis R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

H03K 5153

Patent

active

054402549

ABSTRACT:
An accurate and stable low voltage detect circuit that provides a low voltage detect signal with minimal variation over process and temperature without trimming requirements. The power supply voltage is divided by a resistor voltage divider and compared to the output voltage of a bandgap reference circuit at the inputs of a comparator. The output of the comparator indicates power-on when the voltage divided power supply raises above the bandgap reference voltage. The low voltage detect circuit of the present invention will generate a correct low voltage detect signal even at power supply voltages too low for much of the rest of the circuit to operate properly. At low enough Vcc voltages, a transistor switch disconnects the resistor voltage divider from Vcc, causing all voltages taps off of the resistor voltage divider to drop to ground. Additionally, especially designed bandgap reference and comparator circuits ensure proper operation of the low voltage detect circuit at low power supply voltages.

REFERENCES:
patent: 3725795 (1973-04-01), Mesnhimer
patent: 4301380 (1981-11-01), Thomas
patent: 5003196 (1991-03-01), Kawaguchi
patent: 5034728 (1991-07-01), Taylor

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